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A research team led by paleontologists at the American Museum of Natural History and the Chinese Academy of Sciences have described three new small squirrel-like species that place a poorly understood Mesozoic group of animals firmly in the mammal family tree.

An international team of researchers is challenging a commonly held view that explains how so many species of birds came to inhabit the Neotropics, an area rich in rain forest that extends from Mexico to the southernmost tip of South America.